psychopy - universitetet i bergenpsychopy • python-based software for running experiments • all...

PsychoPy

Sebastian Jentschke

UNIVERSITY OF BERGEN

PsychoPy• Python-based software for running experiments• all major platforms (Win, Mac, Linux)• preliminary support for online experiments• precise timing

(«PsychoPy can achieve high levels of precision and accuracy in the presentation of brief visual stimuli»; Garaizar & Vadillo, PLOS 2014)

• GUI (Builder) and scripting (Coder)• free and open-source (www.psychopy.org)

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PsychoPy

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PsychoPy

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NewOpenSaveSave as...

SettingsCompileRunStop

Publish / run the study online

PsychoPy• routines

– stimuli (text, images, sounds, videos;noise, dots, polygons [all: + aperture + grating])

– responses (keyboard, rating, slider, mouse; [sound] recording)

– custom (code, variable;static [waiting, e.g., to load image])

– I/O (parallel port)

• loops

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PsychoPy

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PsychoPy

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PsychoPy: Components

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1. Click oncomponent(e.g., Text)to add it

2. Adjustsettingsand con-firm with«OK»

PsychoPy: Components

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3. Text component added (right-click on component for changes [edit settings, rename, remove, etc.])

PsychoPy: Components

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Click onFavorites,Stimuli, etc.to see morecomponents

PsychoPy: Text

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• duration can be left empty(needs keyboard for termination)

• Text can be a fixed text or a variable

• letter height and position should be chosen to not overlap

• font should be chosen to be a standard one

PsychoPy: Images

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• duration can be left empty(needs keyboard for termination)

• image can be a file name or a variable(constant vs. set every trial)

• position and size should be chosen to not overlap

• orientation (degrees) and opacity (0 – 1; 1 = solid)

PsychoPy: Keyboard

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• duration can be left emptytick «Force end of Routine»

• multiple allowed key (comma-separated)

• font should be chosen to be standard

• store: nothing, first/last/all key(s)

PsychoPy: Rating

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• stop can be left emptytick «Force end of Routine»(under Advanced)

• (numerical) lowest, highest, start

• labels at lowest, highest• store: nothing, history (Adv.)• untick «Show accept» (Adv.)

PsychoPy: Experiment Settings

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background:(0,0,0) – grey(-1,-1,-1) – black(1,1,1) – white

tick excel + summariesuntick log file

remove «session» if notrequiredpossible addcharacteristics you want to store (age?, gender?)

PsychoPy: Questionnaires• instruction(s): text(s) + keyboard (self-paced end)• loop over questionnaire items

– text (possibly image with prepared graphics to ensure

independence from fonts) + keyboard or rating– Bergen Insomnia Scale

https://helse-bergen.no/seksjon/sovno/Documents/BERGENINSOMNIASCALE1.pdf

– Excel / CSV file with items

• thank you and goodbye: text(s) + keyboard

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PsychoPy: Questionnaires• size and position for question and response

instructions• response format and instructions

is there always the same response (not at all ... very much) or does it need to be variable?

• better use keyboard or rating?• which responses should be stored?

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Assignment 1:Create a questionnaire yourself!

PsychoPy: Experiments• instructions• loop over practice trials (with feedback)

– item presentation– feedback

• loop over experimental trials (without feedback)– item presentation, acquiring responses, possibly

feedback (see next slide for an implementation)

• thank you and good bye

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PsychoPy: Code

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the code component can be usedto give feedback about correct orincorrect reponses; here by assign.an image one of two image files

define correct answer in key-board component

Assignment 2:Discuss and (possibly) create a brief experiment!

PsychoPy: Online experiments• register at pavlovia.org

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PsychoPy: Online experiments• login from within PsychoPy:

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PsychoPy: Online experiments• submit the project to pavlovia.org:

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PsychoPy: Online experiments• run the project at pavlovia.org

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PsychoPy: Literature and help• Peirce, J., & MacAskill, M. (2018). Building

Experiments in PsychoPy. London, UK: Sage Publications.

• https://www.psychopy.org/documentation.html• https://discourse.psychopy.org/

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Thank you for your interest and yourattention!